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Schematic of the experimental setup for generating and testing the performance of QPSK signals. The received optical powers are measured after the VOA and before the first EDFA. OSNR: optical signal to noise ratio. BERT: bit-error-rate tester.

(left) An eye diagram of error-free photodetected output of the demodulated QPSK signals. (right) log(BER) as a function of the received powers and the required OSNR. Squares are for I- phase and circles are for Q-phase.